Urgent: Plz Help me,Prime Number Program Problem

Please support our C++ advertiser: Intel Parallel Studio Home
Thread Solved

•
•
Join Date: Dec 2007
Posts: 2
Reputation: Tiger909 is an unknown quantity at this point 
Solved Threads: 0
Tiger909 Tiger909 is offline Offline
Newbie Poster

Urgent: Plz Help me,Prime Number Program Problem

 
0
  #1
Dec 24th, 2007
hi all,
I am new here,and I wish I could find a solution for this program
My program has to check if the number is prime or not?,
my program is working properly with numbers greater than 1 (n>1),
I want my program to display a friendly message when the user enter number (0) or (1) and then stop the program.
please Help,I tried many times to try to solve this problem but I couldn't !,,
mY hOmework is due on Saturday 29 Dec,
Please Help me
and this is my code :

#include <iostream>
using namespace std;
void main()
{
int x, y;
int z=0;
cout << "Please Enter a positive number\n";
cin >> x;
for (y = 2; y<x; y++)
{
if ((x % y) == 0)
{
z=1;
break;
}
}
if (z==1)
cout << "Not prime number\n";
else
cout << "prime number\n";
}

The problem with my program is when the user enter number 0 or 1 , it outputs is prime number ,0 and 1 ARE NOT PRIME NUMBERS,,please help me and thanks for ur efforts
Last edited by Tiger909; Dec 24th, 2007 at 8:03 am.
Attached Files
File Type: cpp bonus.cpp (280 Bytes, 1 views)
Reply With Quote Quick reply to this message  
•
•
Join Date: Mar 2006
Posts: 176
Reputation: dubeyprateek is an unknown quantity at this point 
Solved Threads: 22
dubeyprateek's Avatar
dubeyprateek dubeyprateek is offline Offline
Junior Poster

Re: Urgent: Plz Help me,Prime Number Program Problem

 
0
  #2
Dec 24th, 2007
Try this
C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. using namespace std;
  3. void main()
  4. {
  5. 	int x, y;
  6. 	int z=0;
  7. 	do{
  8. 		cout << "Please Enter a positive number\n";
  9. 		cin >> x;
  10. 		if(0 == x || 1 == x) {
  11. 			cout<<"Please try again with number other then 0 or 1" <<endl;
  12. 		}
  13. 	}
  14. 	while((0 == x) || (1 == x));
  15.  
  16. 	for (y = 2; y<x; y++)
  17. 	{
  18. 		if ((x % y) == 0)
  19. 		{
  20. 			z=1;
  21. 			break;
  22. 		}
  23. 	}
  24.  
  25. 	if (z==1)
  26. 		cout << "Not prime number\n";
  27. 	else
  28. 		cout << "prime number\n";
  29.  
  30. }
Last edited by dubeyprateek; Dec 24th, 2007 at 9:13 am.
I know I am. Therefore I am.
Reply With Quote Quick reply to this message  
•
•
Join Date: Dec 2007
Posts: 2
Reputation: Tiger909 is an unknown quantity at this point 
Solved Threads: 0
Tiger909 Tiger909 is offline Offline
Newbie Poster

Re: Urgent: Plz Help me,Prime Number Program Problem

 
0
  #3
Dec 24th, 2007
thanks a lot,I appreciate your efforts, it working now,
really,you are wonderful programmer,
Thankssssssssssssssssssss
Last edited by Tiger909; Dec 24th, 2007 at 9:45 am.
There is always Room for Improvement :),

Tiger 909
Reply With Quote Quick reply to this message  
•
•
Join Date: Mar 2006
Posts: 176
Reputation: dubeyprateek is an unknown quantity at this point 
Solved Threads: 22
dubeyprateek's Avatar
dubeyprateek dubeyprateek is offline Offline
Junior Poster

Re: Urgent: Plz Help me,Prime Number Program Problem

 
0
  #4
Dec 24th, 2007
It was easy, you will learn all these very soon.

You know for me it is very true. "There is always Room for Improvement "

Please mark the thread as solved.
I know I am. Therefore I am.
Reply With Quote Quick reply to this message  
•
•
Join Date: Mar 2005
Posts: 464
Reputation: invisal is a jewel in the rough invisal is a jewel in the rough invisal is a jewel in the rough 
Solved Threads: 49
invisal's Avatar
invisal invisal is offline Offline
Posting Pro in Training

Re: Urgent: Plz Help me,Prime Number Program Problem

 
0
  #5
Dec 24th, 2007
Another solution:

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.     int x, y;
  6.     while (true) {
  7.         cout << "Please Enter a positive number\n";
  8.         cin >> x;
  9.         if(0 != x || 1 != x) break;
  10.         cout<<"Please try again with number other then 0 or 1\n";
  11.     }
  12.  
  13.     for (y = 2; y<x; y++) {
  14.         if ((x % y) == 0)
  15.             break;
  16.     }
  17.  
  18.     if (y < x)
  19.         cout << "Not prime number\n";
  20.     else
  21.         cout << "prime number\n";
  22. }

Since you want to check for only positive number and that number must not be 0 and 1, it is advisable to change this
C++ Syntax (Toggle Plain Text) 
  1. if(0 != x || 1 != x) break;
to this:
C++ Syntax (Toggle Plain Text) 
  1. if(x>1) break;
Last edited by invisal; Dec 24th, 2007 at 10:41 am. Reason: Forget open brace
Yesterday is a history, tomorrow is a mystery, today is a gift.
Behind every smile is a tear.
Visal .In
Reply With Quote Quick reply to this message  
Reply

Quick Reply to Thread
This thread has been marked solved.
Perhaps start a new thread instead?
•
•
•
•
•
•
•
•
Message:
•
•
•
•



Other Threads in the C++ Forum
Thread Tools Search this Thread



Tag cloud for C++
api application array arrays assignment beginner binary bitmap c++ c/c++ calculator char char* class classes code coding compile compiler console conversion convert count data database delete developer display dll email encryption error file forms fstream function functions game generator getline givemetehcodez graph homeworkhelper iamthwee ifstream image input int java lazy lib loop looping loops map math matrix memory multidimensional multiple newbie news node number numbertoword output parameter pointer problem program programming project proxy python random read recursion recursive reference return sorting string strings struct template templates text tree url variable vector video visual visualstudio win32 windows winsock word wordfrequency wxwidgets
About Us | Contact Us | Advertise | DaniWeb | Acceptable Use Policy | RSS Feed

©2003 - 2009 DaniWeb® LLC